[georgeteo]

Lets state out the co-relation of electricity with hydraulics

Voltage = Pressure that causes water to flow (a.k.a piston)
V source = Pump Pressure/head (a.k.a battery)
V1 or V2 or V3 = Pressure drop across components
Current = Flow Rate
Resistance = Flow Resistance (tubing, blocks, rad etc..)

All scenarios assuming same components, length of tubing, etc.. Calculations based on the following:
Pump pressure = 10
Radiator #1 and #2 flow resistance = 2
Super restrictive Radiator #3 flow resistance = 6
CPU block flow resistance = 6
GPU block flow resistance = 4

Conditions :
1) CPU block has a more restrictive design as compared to the GPU block, which is commonly the case.
2) Pump Resistance / Y splitter resistance / Tubing Resistance(no kinks, no elbows, shortest length possible) are all Negligible. This is to make calculations easier.
3) Based on the assumption that the CPU block is 3 times more restrictive than the rad and 2 times more restrictive than the GPU block ... and vice versa.
4) Pump head is sustained at a rating of 10 throughout the scenarios. It is obvious that the performance would suffer if the pump can provide 10points of pressure and the components require 20points. But this is not the basis of discussion here. is calculation is based on a perfect situation where the Pump pressure is enough to cater for all the components.
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Scenario #1a
Entire setup in series

Findings :
Flow rate is 0.83 across all components
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Scenario #1b
1 CPU and 1 GPU block in parallel, rest of circuit in series.

Findings :
Flow rate across components is as follows :
Rad = 2.27
CPU = 0.91
GPU = 1.36
Block with higher resistance will receive lesser flow. CPU block is receiving 8%, GPU block is receiving 53% and Rad is receiving 144% more flow as opposed to a pure series setup.
Increasing the pump pressure to twice the value (20) has no effects on the flow distribution ratio between the 2 blocks
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Scenario #2a
Addition of another radiator into the circuit in series. Assuming rad#1 is same as rad #2.

Findings :
Flow rate is 0.714 across all components
Overall Flow rate drops by 11.6% when compared to scenario 1a (only 1 rad present)
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Scenario #2b
Addition of another radiator into the circuit. Rad#1 and Rad#2 now working in parallel. Rest of the circuit in series.

Findings :
Flow rate across components is as follows :
Rad#1 = Rad#2 = 0.454
CPU = GPU = 0.91
Flow rate of CPU and GPU has increased by 19.6% over scenario 2a. CPU flow rate has improved as is now on par with that obtained from scenario 1b, the highest attained so far. GPU flow rate is also clocking in its 2nd highest scores so far. Rad flow rate is at an all time low, the lowest calculated so far.
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Scenario #3a
Rad#1 and CPU in one loop, Rad#2 and GPU in another. Both loops starting and ending at the same pump.

Findings :
Flow rate across components is as follows :
Loop#1 (Rad#1+CPU) = 1.25
Loop#2 (Rad#2+GPU) = 1.667
Total flow rate of both loops = 2.917
Highest flow rates calculated for both the CPU, GPU and rads in parallel. Only losing out to a rad in series as in scenario 1b
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Scenario #3b
One of the rads have been removed and a new restrictive rad is introduced into the setup.
Rad#1 and CPU in loop#1, Rad#3 and GPU in loop#2. Both loops starting and ending at the same pump.

Findings :
Loop#1 (Rad#1+CPU) = 1.25
Loop#2 (Rad#3+GPU) = 1
Total flow rate of both loops = 2.25
Inclusion of the restrictive rad has no impact on the flow rates of loop#1. Flow rates of loop #2 dropped drastically due to the inclusion of the super restrictive rad#3
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Conclusion:
Highest calculated flow rates are ....
CPU = 1.25 (3a,3b)
GPU = 1.25 (3a,3b)
RAD1# = 2.27 (1b)
RAD2# = 1.667 (3a)
RAD3# = 1 (3b)

This is meant to be a pureply mathamatical calculation of the various flow rates we can except from different setups using ohm's and kirchhoff's laws. If I'm wrong ... pls correct me.